Recent advances in photochemical and electrochemically induced thiocyanation: a greener approach for SCN-containing compound formation

Abstract

Techniques utilizing photo- and electrochemically induced reactions have been developed to accelerate organic processes.

Visible light mediated organocatalytic dehydrogenative aza-coupling of 1,3-diones using aryldiazonium salts

“…Over the last two decades, visible light photocatalysis has emerged as a greener approach in organic synthesis. 20 Also, the replacement of volatile organic compounds (VOCs) as solvents with greener media 21 like water 22 has become a need of the day. In line with our current research interest in green chemistry and photoredox catalysis, herein we report an efficient and inexpensive visible light-mediated organocatalysed synthesis of diazenyl compounds using 1,3-diones and aryl diazonium salts without the use of any metal activator or ligand.…”

Synthesis of thiocyanato-containing phenanthrenes and dihydronaphthalenesviaLewis acid-activated tandem electrophilic thiocyanation/carbocyclization of alkynes

“…2–7 Consequently, much effort has been dedicated to developing efficient strategies for the introduction of the thiocyanato group into molecules. 8 Despite their importance, there has been limited progress in the synthesis of aryl thiocyanates. Synthetic strategies that have been developed include nucleophilic or electrophilic thiocyanations of aryl substrates such as arenes, 9 aryl halides, 10 organometallic nucleophiles, 11 arylboron compounds 12 and aryl diazonium salts (Scheme 1a, left).…”

Direct Cyanation of Thiophenols or Thiols to Access Thiocyanates under Electrochemical Conditions

“…It also plays a very important role in organic synthesis, for example, the synthesis of sulfur-containing nitriles − and nitrogen- or sulfur-containing heterocycles . Therefore, the study on the synthesis of organic thiocyanates is of great importance, and a series of effective and practical protocols were developed in recent years . The selections of the reaction partners and the catalytic system are often the key issues for this purpose.…”